SrCu₂(BO₃)₂磁化平台中针轮状束缚三重态对
Pinwheel-shaped bound triplet pairs in the magnetization plateaus of SrCu$_2$(BO$_3$)$_2$
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中文总结 AI 辅助
研究SrCu₂(BO₃)₂磁化平台中低磁化平台的稳定机制，通过张量网络数值模拟和⁶³,⁶⁵Cu核磁共振谱研究，发现1/8和2/15平台谱与自旋-2束缚态预测相符，为磁化平台理论增添束缚态维格纳晶体形成范式。
中文摘要 AI 辅助
在SrCu₂(BO₃)₂中观察到的磁化平台序列，如饱和度的1/8、2/15、1/6、1/4、1/3、2/5和1/2，一直是个谜题。基于张量网络的数值模拟表明低磁化平台是由自旋-2束缚态的维格纳晶体稳定的，而非标准构型。本文报告了高达41.9 T的⁶³,⁶⁵Cu核磁共振谱，基于1/3平台推导的约束条件，表明1/8和2/15平台的谱确实与自旋-2束缚态的预测相符，与三重态晶体不兼容。这为磁化平台理论增添了束缚态维格纳晶体形成这一替代基本范式。
英文摘要
The sequence of magnetization plateaus at 1/8, 2/15, 1/6, 1/4, 1/3, 2/5, and 1/2 of the saturation observed in SrCu$_2$(BO$_3$)$_2$ remained a puzzle until tensor-networks-based numerical simulations suggested that the low-magnetization plateaus are stabilized as Wigner crystals of spin-2 bound states, and not as one of the standard configurations (semiclassical up-down, or crystals of triplets). We report on $^{63,65}$Cu nuclear magnetic resonance spectra up to 41.9 T: Based on constraints deduced from the 1/3 plateau, we show that the spectra in the 1/8 and 2/15 plateaus indeed agree with the prediction for the spin-2 bound states, while being incompatible with a crystal of triplets. This adds the formation of Wigner crystals of bound states as an alternative fundamental paradigm in the theory of magnetization plateaus.
